CN112764440A - Method for preventing spontaneous combustion of coal pile by using water injection steel pipe - Google Patents
Method for preventing spontaneous combustion of coal pile by using water injection steel pipe Download PDFInfo
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- CN112764440A CN112764440A CN202011581150.8A CN202011581150A CN112764440A CN 112764440 A CN112764440 A CN 112764440A CN 202011581150 A CN202011581150 A CN 202011581150A CN 112764440 A CN112764440 A CN 112764440A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a method for preventing a coal pile from spontaneous combustion by using a water injection steel pipe, which comprises the following steps: arranging a water tank beside the coal pile; inserting a water injection steel pipe into the coal pile; a water pump is arranged in the water tank, water in the water tank is pressed into the water injection steel pipe from the water inlet, flows through the whole coal pile and finally flows out from the water outlet, and flows back into the water tank; a temperature sensor is arranged at the water outlet and used for monitoring the temperature of the outlet water flow in real time; a controller connected with the water pump and the temperature sensor is arranged, and the water pump is automatically adjusted according to the outlet water flow temperature detected by the temperature sensor so that the flow velocity entering the coal pile is accelerated to reduce the temperature; and an alarm device connected with the controller is arranged to prompt that a certain position in the coal pile reaches a fire point, and the coal pile is subjected to heat dissipation treatment in time. According to the invention, the water injection steel pipe is inserted into the coal pile, so that the temperature in the coal pile can be effectively reduced, water in the steel pipe continuously and circularly flows, and heat generated by oxidation reaction in the coal pile can be taken away, so that the temperature in the coal pile is kept in a low-temperature state.
Description
Technical Field
The invention belongs to the technical field of coal mine management, and particularly relates to a method for preventing a coal pile from spontaneous combustion by using a water injection steel pipe.
Background
About 50 percent of coal mines in China have natural fire risks, and spontaneous combustion is easily generated inside coal piles due to the chemical and physical properties of the coal piles in the processes of storage and transportation of coal in coal storage yards such as mines, power plants, docks, gathering and transporting stations and the like. In 1982, one cargo ship in taiwan went from New Orleans carrying 65000t of coal to taiwan, and spontaneous combustion occurred in coal in three cargo holds during the course of sailing, and the coal on the ship was damaged. In 2009, spontaneous combustion occurred in an open-air coal pile of a certain storage and transportation company in the city of Changzhou. In 2009, a cargo ship filled with coal started from the Qinhuang island, and spontaneous combustion occurred in the course of sailing. In 2011, spontaneous combustion accidents occurred on the ship carrying "Changdong 68" cargo ship at sea, and the coal resources on the ship were seriously lost. The spontaneous combustion of the coal storage pile reduces the quality of coal bodies on one hand and causes resource waste, and on the other hand seriously threatens the safety production of coal mine enterprises.
The heat pipe technology is utilized to cool the coal storage pile, so that a certain effect is achieved. The heat pipe has been widely used in the fields of electronic element cooling, extraction of deep heat of frozen soil in cold regions, mine temperature regulation, waste heat utilization and the like due to the characteristics of rapid phase change heat conduction, good isothermal property, wide adaptive temperature range and the like. The gravity heat pipe is used as a novel high-efficiency heat transfer element, has the general characteristic of the heat pipe, and can realize the function of long-distance transmission of a large amount of heat through a small section without the action of external force. The heat pipe is used as a device with extremely strong one-way heat conduction capability, has the potential of destroying the coal spontaneous combustion heat storage environment, and can be used as a novel technical means for preventing and treating coal spontaneous combustion disasters.
The gravity heat pipe is inserted into the coal pile, when the coal pile is oxidized to cause the heat accumulation of the coal bed, a high heat source in the coal pile can be used as a starting heat source of an evaporation section of the heat pipe, and the working medium in the heat pipe absorbs the heat and then is changed into steam to transfer the heat in the coal bed to a condensation section. The heat pipe condensation segment is cooled down under the air convection effect, and the heat pipe working medium condenses for liquid again after the cooling, has flowed back the evaporation zone under the action of gravity, has hoped like this to realize the thermal automatic heat transfer in succession in deep in the coal seam to destroy the inside heat accumulation environment in coal seam, reduce the oxidation zone temperature, effectively prevent the coal pile phenomenon of spontaneous combustion. The principle that the heat pipe automatically transfers the natural heat of the coal pile is to utilize the characteristic that the thermal diode can capture and store cold, and meanwhile, the temperature difference between the inside and the outside of the coal pile provides power guarantee for the normal operation of the heat pipe.
The use of heat pipes has the following disadvantages:
1. the method for cooling the coal storage pile by utilizing the heat pipe has higher cost, can be used in a proper amount in a small coal storage pile, but needs to insert a great number of heat pipes for the coal storage pile with larger volume because the cooling area of one heat pipe is limited.
2. The length of the heat pipe is limited, so the depth of the heat pipe inserted into the coal pile is limited, and if the heat pipe is inserted too deep, the evaporation of liquid in the heat pipe is influenced, and the temperature reduction efficiency of the heat pipe is also greatly influenced. Therefore, if the temperature in the deep part of the large coal pile rises, the heat pipe can not disperse the heat in the coal pile.
3. The cooling efficiency of the heat pipes is influenced by too many factors, and the inserting angle of the heat pipes, the inserting depth of the heat pipes, the number of the heat pipes and the arrangement of the heat pipes in the coal pile all influence the cooling efficiency of the heat pipes.
4. Because the heat pipe takes away heat through liquid evaporation and condensation, the speed is low, the range is small, and the cooling efficiency is low.
In addition, the coal pile is cooled by adopting an anaerobic technology: when the coal body spontaneously combusts below 70 ℃, the temperature slowly increases along with the time; when the temperature is higher than 100 ℃, the oxygen consumption rate and the heat intensity slowly increase along with the temperature; in the anaerobic cooling process, the cooling rate is reduced along with the reduction of the temperature, and when the temperature of the coal is reduced from 452.7 ℃ to 250 ℃, the cooling rate is rapidly reduced; when the coal temperature is lower than 250 ℃, the cooling rate slowly decreases. But the anaerobic technology has a slow cooling rate, is only suitable for indoor coal storage piles, is not suitable for outdoor use and does not have universality.
The multi-state foam technology synthesized by the sol foam/polycaprolactone and the organic acid realizes the coal pile cooling: the technology comprises the steps of performing potential measurement on the formation of the SFP solution and the PF, and performing differential scanning calorimeter/thermogravimetric analyzer, x-ray diffraction, x-ray photoelectron spectroscopy and PF infrared analysis. The PF solution contains 0.7% of polycaprolactone and has strong electrostatic repulsion, organic acid is injected into the SFP solution, gas is injected within 30s, water-containing foam is generated, after two minutes and three minutes, the chemical reaction between sodium silicate and the organic acid generates PF, the PF can absorb heat generated by low-temperature oxidation of coal, moisture is provided for the coal, spontaneous combustion is prevented, and a heat-stable coating is formed on the surface of the coal to extinguish fire. However, the multi-state foam technology is complex to operate, the practical application of the multi-state foam technology is limited specifically, the operation cost is high, and the multi-state foam technology cannot be widely used.
Disclosure of Invention
Based on the defects of the prior art, the technical problem to be solved by the invention is to provide the method for preventing the spontaneous combustion of the coal pile by using the water injection steel pipe, so that the cost for preventing the spontaneous combustion of the coal pile is reduced, the method can be used for internal cooling treatment of large-scale open-air coal piles and gangue piles, the heat is taken away through the circular flow of water, the cooling efficiency is high, the cooling speed is high, and the coal pile can be comprehensively cooled.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a method for preventing spontaneous combustion of a coal pile by using a water injection steel pipe, which comprises the following steps:
s1: arranging a water tank beside the coal pile;
s2: inserting a water injection steel pipe into the coal pile;
s3: a water pump is arranged in the water tank, water in the water tank is pressed into the water injection steel pipe from the water inlet under the action of the water pump, flows through the whole coal pile and finally flows out of the water outlet and flows back into the water tank;
s4: a temperature sensor is arranged at the water outlet and used for monitoring the temperature of the water flow at the outlet in real time;
s5: a controller connected with the water pump and the temperature sensor is arranged, and the water pump is automatically adjusted according to the outlet water flow temperature detected by the temperature sensor so that the flow velocity entering the coal pile is accelerated to reduce the temperature;
s6: and an alarm device connected with the controller is arranged, when the temperature of the water flow at the outlet exceeds 70 ℃, the alarm device is automatically triggered to prompt that a certain position in the coal pile reaches a fire point, and the coal pile is subjected to heat dissipation treatment in time.
Optionally, in step S2, the arrangement of the water injection steel pipe is divided into a left part, a middle part and a right part, the left part and the right part both include a plurality of vertical spiral pipes, and the vertical spiral pipes are connected by straight pipes; the middle part is a convolute U-shaped pipe which can keep the internal temperature in a low temperature state.
Further, in step S5, the water pump has three thresholds corresponding to different temperature ranges of the outlet water temperature, and when the outlet water temperature is below 25 ℃, the water pump is kept at a slow rotation speed; when the highest temperature of the outlet water flow reaches 25-40 ℃, the water pump can be adjusted to a middle rotating speed; when the temperature of the outlet water flow is higher than 40 ℃, the water pump can be automatically adjusted to a high rotating speed according to the instruction of the controller.
Optionally, the spiral U-shaped pipe is divided into three layers, which respectively reduce the temperature of three low, medium and high positions inside the coal pile, and more accurately cool the coal pile in all directions.
Optionally, the water tank is provided with a radiator for cooling the water flowing into the water tank sufficiently inside the water tank.
Therefore, the method for preventing the spontaneous combustion of the coal pile by using the water injection steel pipe has at least the following beneficial effects:
1. the coal storage device is not limited by external conditions, can be freely placed according to coal storage piles in different shapes, and can be used in the deep part of a large coal pile; the coal pile can be comprehensively cooled, the temperature rising at the position 2-3m high and 1-2m high inside the windward side of the coal pile is fastest according to simulation experiments of the coal pile, and the spiral steel pipe can be arranged to achieve the effect of large-area cooling.
2. The water injection steel pipe is inserted into the coal pile, so that the temperature inside the coal pile can be effectively reduced. The water in the steel pipe continuously flows in a circulating way, so that the heat generated by oxidation reaction in the coal pile can be taken away, the temperature in the coal pile is kept at a low temperature state, and the loss of the coal caused by spontaneous combustion in the storage process is greatly reduced. The water flow speed in the steel pipe can be automatically adjusted according to the temperature.
3. The heat is taken away through the circular flow of the water, the cooling efficiency is high, and the cooling speed is high.
4. The cost is reduced by using a water circulation method.
5. There is no limit to the height of the coal pile.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments, together with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a front view of a coal pile injection steel pipe according to the present invention;
FIG. 2 is a front view of the steel pipe for injecting water into a coal pile according to the present invention;
FIG. 3 is a front view of the coal pile injection steel pipe of the present invention;
fig. 4 is a graph showing the change in internal temperature of the coal pile for 60 days.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which form a part of this specification, and which illustrate, by way of example, the principles of the invention. In the referenced drawings, the same or similar components in different drawings are denoted by the same reference numerals.
As shown in fig. 1 to 3, the method for preventing spontaneous combustion of coal pile by using water injection steel pipe of the present invention is to insert water injection steel pipe into coal pile, and to take away heat accumulated and not emitted due to oxidation heat release in coal pile by circulation flow of water in steel pipe and good heat conductivity of steel pipe.
The cuboid on the left side in the figure 1 is a water tank, water is pressed into a pipeline of a water injection steel pipe from a water inlet under the work of a water pump, flows through the whole coal pile and finally flows out from a water outlet, and flows back into the water tank. The water tank is provided with a radiator close to the left side in a row, so that the water flowing into the water tank can be fully cooled in the water tank. The water outlet is provided with a temperature sensor, the temperature sensor and the water pump are connected with the controller and used for monitoring the temperature of outlet water flow in real time so as to control the temperature of the coal pile, if the water temperature is higher, the temperature inside the coal pile is too high, and the controller can automatically adjust the water pump to enable the flow rate to be cooled in an accelerating manner. The water pump has three thresholds (fast, medium and slow) respectively corresponding to different temperature ranges of the outlet water flow, and when the temperature of the outlet water flow is below 25 ℃, the water pump keeps a slow rotating speed; when the temperature of the outlet water flow reaches 25-40 ℃, the water pump can be adjusted to a middle rotating speed; when the temperature of the outlet water flow is higher than 40 ℃, the water pump can be automatically adjusted to a 'fast' rotating speed according to the instruction of the controller.
Meanwhile, the controller is also connected with an alarm device, when the temperature of the water flow at the outlet exceeds 70 ℃ due to overhigh temperature caused by other uncontrollable reasons in the coal pile, the alarm device is automatically triggered to prompt that the ignition point of a certain position in the coal pile is reached, and the coal pile is required to be subjected to heat dissipation treatment in time.
The arrangement of the water injection steel pipes can be changed according to the shape of the coal pile, the water injection steel pipes are uniformly distributed in the coal pile, and the arrangement of the water injection steel pipes is divided into a left part, a middle part and a right part. As can be seen from fig. 4, the closer to the surface of the coal storage pile, the more heat is accumulated, so that the vertical spiral arrangement is arranged on the left and right sides of the surface of the coal storage pile for the purpose of cooling in a larger range, the left and right parts both comprise three vertical spiral pipes, and the spiral pipes are connected by straight pipes; the middle part of the water injection steel pipe is a convoluted U-shaped pipe, the inner convoluted U-shaped pipe in the middle of the coal pile can keep the inner temperature in a low-temperature state, the convoluted U-shaped pipe is divided into three layers, the temperature of three low and high positions in the coal pile can be reduced respectively, and therefore the coal pile can be cooled more accurately in all directions. As can be seen in FIG. 3, all the water pipes in the coal pile are communicated together, so that the arrangement of a plurality of water inlets and water outlets is avoided, and the coal pile is easy to assemble and convenient to disassemble. Meanwhile, the assembling form of the water injection steel pipe and the thickness of the steel pipe can be randomly changed according to the size and the shape of the coal pile.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. A method for preventing spontaneous combustion of coal piles by using water injection steel pipes is characterized by comprising the following steps:
s1: arranging a water tank beside the coal pile;
s2: inserting a water injection steel pipe into the coal pile;
s3: a water pump is arranged in the water tank, water in the water tank is pressed into the water injection steel pipe from the water inlet under the action of the water pump, flows through the whole coal pile and finally flows out of the water outlet and flows back into the water tank;
s4: a temperature sensor is arranged at the water outlet and used for monitoring the temperature of the water flow at the outlet in real time;
s5: a controller connected with the water pump and the temperature sensor is arranged, and the water pump is automatically adjusted according to the outlet water flow temperature detected by the temperature sensor so that the flow velocity entering the coal pile is accelerated to reduce the temperature;
s6: and an alarm device connected with the controller is arranged, when the temperature of the water flow at the outlet exceeds 70 ℃, the alarm device is automatically triggered to prompt that a certain position in the coal pile reaches a fire point, and the coal pile is subjected to heat dissipation treatment in time.
2. The method for preventing spontaneous combustion of a coal pile using a water injection steel pipe as claimed in claim 1, wherein in step S2, the arrangement of the water injection steel pipe is divided into a left, a middle and a right portion, both of which comprise a plurality of vertical spiral pipes, each of which is connected by a straight pipe; the middle part is a convolute U-shaped pipe which can keep the internal temperature in a low temperature state.
3. The method for preventing spontaneous combustion of a coal pile using water injection steel pipes as claimed in claim 1, wherein the water pump has three thresholds respectively corresponding to different temperature ranges of the leaving water temperature at step S5, and the water pump is maintained at a slow rotation speed when the temperature of the leaving water is below 25 ℃; when the highest temperature of the outlet water flow reaches 25-40 ℃, the water pump can be adjusted to a middle rotating speed; when the temperature of the outlet water flow is higher than 40 ℃, the water pump can be automatically adjusted to a high rotating speed according to the instruction of the controller.
4. The method for preventing the spontaneous combustion of the coal pile by using the water injection steel pipe as claimed in claim 2, wherein the spiral U-shaped pipe is divided into three layers, the temperature of the three lower and upper parts inside the coal pile is respectively reduced, and the coal pile is more accurately cooled in all directions.
5. The method for preventing the spontaneous combustion of the coal pile using the water injection steel pipe as set forth in claim 1, wherein a radiator is provided on the water tank for sufficiently cooling the water flowing into the water tank inside the water tank.
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| CN202011581150.8A CN112764440A (en) | 2020-12-28 | 2020-12-28 | Method for preventing spontaneous combustion of coal pile by using water injection steel pipe |
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| CN202011581150.8A CN112764440A (en) | 2020-12-28 | 2020-12-28 | Method for preventing spontaneous combustion of coal pile by using water injection steel pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439536A (en) * | 2022-02-10 | 2022-05-06 | 陇东学院 | Device for preventing spontaneous combustion of coal in coal bed |
| CN116878310A (en) * | 2023-07-20 | 2023-10-13 | 中国矿业大学(北京) | Circulation water type coal storage pile oxidation heat energy utilization and spontaneous combustion control system |
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| JPH08750A (en) * | 1994-06-24 | 1996-01-09 | Ishikawajima Harima Heavy Ind Co Ltd | Fire preventing device for coal bunker |
| KR20110098158A (en) * | 2010-02-26 | 2011-09-01 | 현대제철 주식회사 | Apparatus for extinguishing spontaneous combustion of a large coal pile |
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| CN206601638U (en) * | 2017-03-22 | 2017-10-31 | 交通运输部公路科学研究所 | A kind of mass concrete active temperature control device |
| CN207299134U (en) * | 2017-09-14 | 2018-05-01 | 河南理工大学 | A kind of heating system using coal mine gob heat source |
| CN209166163U (en) * | 2018-10-31 | 2019-07-26 | 郑永涛 | A kind of device that can reduce spontaneous combustionof coal point |
| CN111734139A (en) * | 2020-07-27 | 2020-10-02 | 安徽贝慕物联科技有限公司 | Automatic integrated system of bulky concrete control by temperature change |
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2020
- 2020-12-28 CN CN202011581150.8A patent/CN112764440A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08750A (en) * | 1994-06-24 | 1996-01-09 | Ishikawajima Harima Heavy Ind Co Ltd | Fire preventing device for coal bunker |
| KR20110098158A (en) * | 2010-02-26 | 2011-09-01 | 현대제철 주식회사 | Apparatus for extinguishing spontaneous combustion of a large coal pile |
| CN205087434U (en) * | 2015-09-17 | 2016-03-16 | 新疆天池能源有限责任公司 | Alleviate device of coal pile spontaneous combustion |
| CN206601638U (en) * | 2017-03-22 | 2017-10-31 | 交通运输部公路科学研究所 | A kind of mass concrete active temperature control device |
| CN207299134U (en) * | 2017-09-14 | 2018-05-01 | 河南理工大学 | A kind of heating system using coal mine gob heat source |
| CN209166163U (en) * | 2018-10-31 | 2019-07-26 | 郑永涛 | A kind of device that can reduce spontaneous combustionof coal point |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439536A (en) * | 2022-02-10 | 2022-05-06 | 陇东学院 | Device for preventing spontaneous combustion of coal in coal bed |
| CN116878310A (en) * | 2023-07-20 | 2023-10-13 | 中国矿业大学(北京) | Circulation water type coal storage pile oxidation heat energy utilization and spontaneous combustion control system |
| CN116878310B (en) * | 2023-07-20 | 2023-12-08 | 中国矿业大学(北京) | Circulation water type coal storage pile oxidation heat energy utilization and spontaneous combustion control system |
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